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Platelet aggregation studies: autologous platelet-poor plasma inhibits platelet aggregation when added to

Marco Cattaneo1, Anna Lecchi, Maddalena Loredana Zighetti

  • 1Unità di Ematologia e Trombosi, Ospedale San Paolo, DMCO Università di Milan, Milan, Italy. marco.cattaneo@unimi.it

Haematologica
|May 10, 2007
PubMed

Adjusting platelet count (PC) in platelet-rich plasma (PRP) using platelet-poor plasma (PPP) is recommended for platelet aggregation (PA) studies, but it could also affect PA independently of the decrease in PC. Analysis of aggregation tracings from healthy controls showed that PC correlated with PA in 47 diluted-PRPs, but not in 104 undiluted-PRPs. Dilution of 9 PRPs with PPP progressively decreased PA, while dilution of washed platelets with buffer hardly affected PA. Apyrase partially prevented the inhibitory effect of PPP. Therefore, the practice of diluting PRP with PPP to adjust platelet count should be avoided because it artefactually inhibits PA.

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